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WhatsApp: +86 18221755073The SR value is a number from 0 to 1.0. A value of 0 indicates that the material absorbs all solar energy and a value of 1.0 indicates total reflectance. Energy Star requires an initial SR value of 0.25 or higher for steep slope (>2:12) roofs and 0.15 or greater after three years. Low slope roofs require an initial SR value of 0.65 or higher ...
WhatsApp: +86 18221755073See LEED interpretations #2450 and #10113. #10113 says "to determine the SRI value for materials that do not have recognized standard values (e.g. new gray concrete) the …
WhatsApp: +86 18221755073Generally the higher the SRI, the better the roofing material's ability to reduce heat transfer into the building. The SRI value is calculated based on: • The aged solar reflectance and the thermal emittance of the roofing material • The SRI worksheet also takes inputs for the roof slope The SRI alternative is useful when a particular product
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WhatsApp: +86 18221755073Stone sizes were a nominal 1 1/2-inch (38-mm) diameter. One roof section had 10 pounds per square foot (49 kg/m2) of stone, the minimum allowed for ballast. Another roof section had 17 pounds per square foot (83 kg/m2) of ballast, and the third roof section featured 24 pounds per square foot (117 kg/m2).
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WhatsApp: +86 18221755073To calculate the SRI, a scale is used that typically ranges from 0 to 100: 0: A standard black surface, which absorbs the most heat and reflects the least. 100: A standard …
WhatsApp: +86 18221755073yes the review accepted our value of SRi about the wood and we achieved this credit. We used the excel-tools "SSc7.2_Weighted Calc-1.xlsx" to calculate the mix area of our roof (green, wood, gravel and concrete) that you find on line at the follow link:
WhatsApp: +86 18221755073Calculate Ballast Rock 4"- 6" Type in inches and feet of your project and calculate the estimated amount of Rip Rap / Boulders in cubic yards, cubic feet and Tons, that your need for your project. The Density of Ballast Rock 4"- 6" : 2,410 lb/yd³ or 1.21 t/yd³ or 0.8 yd³/t
WhatsApp: +86 18221755073For roofing materials, a good SRI value is typically above 78, signifying superior reflective properties. SRI To SR Conversion. To convert between SRI and solar reflectance (SR), you can use formulas and charts provided by standards …
WhatsApp: +86 18221755073About #4 Limestone Ballast #4 Limestone Ballast stone is a crushed angular Limestone aggregate. Sizes of #4 Stone range from 1 1/2" - 2 1/2" up to 4" stones. Common applications: - Driveway stone to support heavy vehicles such as RVs, dump trucks or boats - Entryway stone, especially for muddy areas - Railroad Ballast - Heavy Drainage - Erosion ...
WhatsApp: +86 18221755073Railroad ballast is one of the most demanding applications for crushed stone. Railroad ballast serves as a bed for railroad tracks and provides track stability, drainage, and support of significant loads carried by railcars. In addition, it deters the growth of vegetation and allows for track maintenance to be performed more easily.
WhatsApp: +86 18221755073A CRRC product rating describes the radiative performance of a roofing material; it does not indicate a ranking or approval. A product's placement on the Rated Products Directory (Directory) does not mean that the product is "cool" as defined by any particular code or program. Only products with active ratings can be found on the ...
WhatsApp: +86 18221755073The two main types of ballast used for roof assemblies are smooth, river-washed stone and concrete roof pavers. We can still design a reflective ballasted roof using certain roof pavers, such as Hanover Pavers' highly reflective Glacier White, which has an SRI of 84.
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WhatsApp: +86 18221755073As part of the study, titled Evaluating the Energy Performance of Ballasted Roof Systems, six roof panels - four ballasted EPDM featuring different stone/paver ballast weights and two control panels (a white TPO and a black EPDM membrane) - were subjected to daily weather cycles side-by-side from March 2004 through April 2006. Among the key ...
WhatsApp: +86 18221755073The amount of ballast varies from 50 to 65 kg/m² (10 to 13 psf) in conventionally loose-laid, gravel stone ballasted single-ply assemblies. Ballast is assumed to be round, 38 mm (1.5 in.) or 64 mm (2.4 in.) smooth stone consisting of ballast …
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WhatsApp: +86 18221755073The Ballasted EPDM Roof System utilizes large EPDM sheets held in place by smooth river stone or pavers. This system is extremely versatile and available in several different variations. When stone ballast is used, this system is the most economical. The smooth stones used in this system offer an aesthetically pleasing surface appearance.
WhatsApp: +86 18221755073In fact, the weight of the stone ballast is what holds the roof components in place. The weight can vary from 10 pounds per square foot (the minimum allowed by code) to 25 pounds or more. The most common ballasted assembly was a loose-laid EPDM membrane over a rigid insulation board.
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WhatsApp: +86 18221755073The most effective measure of a roofing material's ability to reject solar heat is the solar reflectance index (SRI), a measure of the constructed surface's ability to stay cool in the sun by reflecting solar radiation and emitting thermal radiation. However, solar reflectance, or SR, is a better way to measure materials that have more thermal mass, including nonroof materials. …
WhatsApp: +86 18221755073Understanding River Rock Stone Sizes. Before diving into the various aspects of choosing the right river rock stone size, it is important to understand the significance of size in achieving your desired landscaping or decorative outcome. The size of river rock stones can greatly impact the overall aesthetics and functionality of your project.
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